2003/01/14 by Yu Zhu, Qing-feng Sun, Qing‐Feng Sun +1
Physics and Astronomy · #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.69.121302
10 pages, 3 figures
arxiv created 2003/01/14 · openalex publication_date 2004/03/09 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We propose an efficient mechanism for the operation of writing spin in a quantum dot, which is an ideal candidate for qubit. The idea is based on the Andreev reflection induced spin polarization (ARISP) in a ferromagnetic/quantum-dot/superconductor system. We find that on the resonance of Andreev reflection, the spin polarization of quantum dot strongly depends on the magnetization of ferromagnetic electrode, and the sign of the spin polarization is controllable by bias voltage. In the presence of intradot interaction, we show that ARISP effect can still survive as long as the charging energy U is comparable to the superconducting gap \ensuremathΔ. Detailed conditions and properties of ARISP are also discussed.